Voltage-control system



June 17, 1930. R. FULLER 1,764,414

VOLTAGE CONTROL SYSTEM Filed July 6, 1927 INVENTOR A'II'TORNEY Paton tedJune 17, 1930 UNITED STATES PATENT. OFFICE BUDOLF PUILEB, 0FBEBLllN-SIEIENSSTADT, GERMANY, AS SlIGNOR TO WESTINGHOUSE ELECTRIC &IANUFAGIUBING COMPANY, A CORPORATION OF PENNSYLVANIA VOLTAGE-CONTROLSYSTEM:

Application filed July 6, 1927, Serial No. 203,776, and in Germany July8, 1928.

switch 9 by a conductor 16. A conductor 17 My invention relates to avoltage control system, and has particular'reference to acircuit-controlling arrangement for obtaining a large number ofdifferent magnitudes of voltage in proportion to the number of switchesand taps that are utilized.

It is characteristic of my invention that a of a transformer is utilizedin conjunction with a pluralityof windings connected in series in anadditive sense, together with one or more windings inductively relatedto said first named windings, a suitable switching arrangement servingto connect all ofthe windings in'diiferent and suitable relations withrespect to each other. I

My invention resides in the system and combination of parts of thecharacter hereinafter described and claimed.

For an illustration of some ofthe forms my invention may take, referenceis to be had tothe accompanymg drawing, in which Figure 1 is adiagrammatic view. of a voltage control system constructed in accordancewith my invention.

Fig. 2 is a diagrammatic view of a modified form of voltage controlsystem.

Referring to Figure 1, there is illustrated a secondary coil or windingS to' which the conductors 1, 2, 3, 4 and 5 are conductively related. Asshown, conductors 1 and 5 are connected to the respective terminals ofthe aforesaid winding S, while the conductors 2, 3 and 4 are soconnected to said winding S, that the portions thereof between adjacentconductors are substantially equal. Coacting with the terminals of therespective conductors 2, 3, 4 and 5, are the circuit breakers orswitches 6, 7, 8 and 9.

A plurality of stationary auxiliary transformers 10 and 11,v in theexample shown, comprise, respectively, primary coils or windings 12 and13 connected in series in an addi- 'tive sense. To this end, the properterminals of the windings 12 and 13 are connected together by aconductor 14. The other terminal of winding 12 is connected by aconductor 15 to the aforesaid switch 6, while the other terminal ofwinding 13 is connected to the is connected to the conductors 15 and 16and interposed therein are the switches 18 and 19, utilizable, whenclosed, for short circuiting the respective windings 12 and 13. In'orderand 13.

The switches 6 and 8 should be conductively related to the same-terminalof winding 12 and, hence, the last named switch has-connected thereto aconductor 21 connected either to the conductor 17 or the conductor 15.Likewise, the switches 7 and-9 should be connected to the same terminalof winding 13 and, hence, the first named switch has connected thereto aconductor 22 leading either to the conductor 16 or the conductor 17.

Disposed, respectively, on the cores of transformers 10 and 11 are-thecoils or windings 23 and 24 forming, in the example shown, secondarywindings for the transformers. Windings 23 and 24 should be con- ,nectedin series and should oppose each other,

the conductor 17 intermediate the switches 18 and 19. The other free endof winding 24, in the example shown, is connected by a conductor 27 toone terminal of a suitable energy-consuming device, as a motor M, theother terminal of which is connected to the aforesaid conductor 1.

Assuming that p0 is the voltage across that section of winding S betweenthe conductors 1 and 2 and that p is the voltage across each of theremaining sections of-winding S, and that the windings 23 and 24, whenenergized, each produce a voltage corresponding to one fourth thevoltage between adjacent conductors 2, 3, 4 and 5, the following voltaes may be obtained with the connectio'ns in icated:

swam. closed EL Vo me si ner-Jacobean In general, three intermediatevoltages ma be obtained between adjacent taps, and it ol,lows,therefore,that if n taps and n+2 switches are present, there are n+3(n1) or 4'n-3difi'erent voltage steps.

In the form of our invention illustrated in Fig. 2, there is utilized asingle core in I will traverse the leg ofthe transformer having the coil31 mounted thereon in an oppo? site direction than if the switch 7 aloneis closed. The action of the coil 31, therefore, is additive. in thefirst case and subtractive I in the second case, and under otherwisesimilar conditions, the same voltage steps may be obtained with theconstruction illustrated in Fig. 2 as specified in the above notedtable.

It shall be understood that on the core 30, a lurality of secondarycoils may be provid which coils are similar to the coil 31.

However, the arrangement as illustrated in Fig. 2, is simpler andordinarily sufiicient for the intended purpose, since the coil 31 isenergized alternately only by the primary coils 12"and 13 and is neverenergizedsimultaneous'ly thereby.

It shall also be understood that the individual voltage steps of themain transformer need not necessarily be etfiual to each other;Furthermore, it is prefera le that the ratio of transformation in bothauxiliary transformers be the same, and such ratio may desirably partakeof the value of 4 1; this may be varied, however, if found desirable.The disclosed arrangement utilizing equal volt-.

.age steps and a ratio of transformation of the value Just specified isparticularly desirable in that all of the voltage steps differ from eachother by the same value. However, it shall be understood thatmyinvention is not limited in this respect. 1

Although my invention has been illusformer, or otherwise, as 111 mat inconnection with the-seconds winding, as windin I S, of a transformer, 1tshallv be unders that the di'sclosedarran ements may be utilized 'inconnection wit the primary winding of such a transay be desirable.

I claim as m invention:

1. The'combmation with a source of electromotive force, of meanscomprising circuitinterrupting devices for deriving from said source aplurality of difierent magnitudes of electromotive force, a connectioncomprising a plurality of windings connected in series in an additivewith each other and with said circuit-interrupting devices, means foreliminating one of said windings from said connection, and a windingcoacting with the windings of said connection and conected to thelatter.

' 2. The combination with a source of electromotive force,'of meanscomprising circuitinterrupting devices for deriving from said source-aplurality of difierent magnitudes of electromotive force, a connectioncomprising a plurality of windingsconnected in'series in an additivesense with'each other and with said circuit-interru ting devices, meansfor eliminating eithero "said windings from said connection, and awinding coacting with the.

windings-of said connection and connected to the latter. r

3. The combination with a source of electromotive force, of meanscomprising circuitinterrupting devices .for deriving from said source aplurality of different magnitudes of electromotive force, a connectioncomprising a plurality of windings connected in series in an additivesense witheach other and with said circuit-interruptin eliminating oneof sai connection, a winding coacting with the windings of saidconnection and connected to the latter, and an energy-consuming devicedevices, means for windings from said connected to said lastnamedwinding and to said source of electromotive force.

In testimony whereof, I have hereunto subscribed my name this 22nd da ofJune, 1927.

. RUDQL PULLER.

